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Quick question, can the 3120 Classic be charged by USB? The data cable indicates that it'll charge by USB with "compatible" phones but there's no mention anywhere about which phones support USB charging. (Of course, I can get a seperate USB->2mm charger if need be, but just hauling around one USB cable is much simpler).

In addition to what have grschinon said, you can use the Nokia CA-101 for charging your device through the USB slot - although it does not split access since it still uses the 2.0mm charging slot in the phone.

I am using CA-100 with my 3270 Classic. When the phone has a high charge, the cable works fine. But when the charge is lower, it starts getting intermittent problems charging.

I have found that if I connect a USB hub first to the computer/laptop/portable battery, and then connect the phone to the hub, it charges perfectly every time.

I can only vouch for the hub I use, which is the Logitech Premium 4-Port USB Hub for Notebook (this is a powered hub, but can be used un-powered). I use it without external power.

I am guessing that the CA-100 cable doesn't properly alert the port that a device has been connected, so it won't pump more juice through, however the hub alerts the port that it requires all the juice it can throw at it, which is then distributed to any hub-connected devices.

If I am correct it will actually charge faster than without the hub, especially if there are no other devices. If I am wrong, well, it works for me.